Testing the permeability of stretch film
Source：Testing the permeability of stretch filmTime：2019-03-04Visitors：
The gas permeability of the stretched film is mainly expressed by the amount of gas permeation and the gas permeability coefficient. The gas permeation amount refers to the volume of gas per unit area of the film to be tested per unit time when it is stably transmitted under constant temperature and unit pressure difference; the gas permeability coefficient refers to the constant temperature and unit pressure difference. When the transmission is stable, the unit thickness of the film to be tested and the volume of gas per unit area per unit time.
The gas permeability test of the stretched film is carried out on a special instrument by separating the high pressure chamber and the low pressure chamber in the instrument with the film to be tested and sealing. There is about 105 Pa of test gas in the high pressure chamber. The volume of the low pressure chamber is known. At the beginning of the test, the low pressure indoor air is first evacuated by a vacuum pump, and the pressure is close to zero. Then, the pressure riser of the low pressure chamber is detected by a manometer.
The following should be noted when detecting the gas permeability of the stretched film:
1. The temperature should be strictly controlled during the test.
2. Degassing and venting during the test process take a long time. The detection of the pressure in the low pressure chamber should be recorded after stable penetration.
3. The test inspection process is carried out under the condition of the pressure difference between the two high and low pressure chambers. Therefore, in order to ensure the accuracy of the test test data, it is necessary to pay attention to the sealing performance of each system in the work instrument.
The gas permeability test of the stretched film is carried out on a special instrument by separating the high pressure chamber and the low pressure chamber in the instrument with the film to be tested and sealing. There is about 105 Pa of test gas in the high pressure chamber. The volume of the low pressure chamber is known. At the beginning of the test, the low pressure indoor air is first evacuated by a vacuum pump, and the pressure is close to zero. Then, the pressure riser of the low pressure chamber is detected by a manometer.
The following should be noted when detecting the gas permeability of the stretched film:
1. The temperature should be strictly controlled during the test.
2. Degassing and venting during the test process take a long time. The detection of the pressure in the low pressure chamber should be recorded after stable penetration.
3. The test inspection process is carried out under the condition of the pressure difference between the two high and low pressure chambers. Therefore, in order to ensure the accuracy of the test test data, it is necessary to pay attention to the sealing performance of each system in the work instrument.
Recommended Products
Ranked in the same article
- how to use the stretch film technology to r
- Plastic film degradation
- How to guarantee punctual shipment for our
- Five common quality problems of PE protecti
- Why insufficient transparency of stretch w
- Standard for use of stretch films
- The use form of stretch film
- What is the difference between stretch film
- The elastic characteristics of plastic film
- Electrical wire film VS electrostatic film
- Uses of Stretch Wrap Film
Latest news articles
- How to save stretch film
- Four characteristics of the wrapping film
- Classification of stretched film
- How can we get detailed price list？
- Calculation of the quality of stretched fil
- The elastic characteristics of plastic film
- The feature of Stretch film and application
- Classification and advantages of stretch fi
- The product has many more uses in pallet un
- How to guarantee punctual shipment for our
- Application field of stretch wrapping film
